Heart rate monitor



FIG. 1 is a perspective view of a first embodiment of our heart rate monitor;

FIG. 2 is another perspective view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a first end view thereof;

FIG. 7 is a second end view thereof;

FIG. 8 is a perspective view of a second embodiment of our heart rate monitor;

FIG. 9 is another perspective view thereof;

FIG. 10 is a side view thereof;

FIG. 11 is a top view thereof;

FIG. 12 is a bottom view thereof;

FIG. 13 is a first end view thereof; and,

FIG. 14 is a second end view thereof.

The subject matter shown in broken lines is for the purpose of illustrating portions of the heart rate monitor and forms no part of the claimed design. 

CLAIM The ornamental design for a heart rate monitor, as shown and described. 